package com.clark.mutable;

/**
 * A mutable <code>short</code> wrapper.
 * 
 * @see Short
 * @since 2.1
 * @author Apache Software Foundation
 * @version $Id: MutableShort.java 916081 2010-02-25 01:28:13Z niallp $
 */
public class MutableShort extends Number implements Comparable<MutableShort>,
        Mutable<Number> {

    /**
     * Required for serialization support.
     * 
     * @see java.io.Serializable
     */
    private static final long serialVersionUID = -2135791679L;

    /** The mutable value. */
    private short value;

    /**
     * Constructs a new MutableShort with the default value of zero.
     */
    public MutableShort() {
        super();
    }

    /**
     * Constructs a new MutableShort with the specified value.
     * 
     * @param value
     *            the initial value to store
     */
    public MutableShort(short value) {
        super();
        this.value = value;
    }

    /**
     * Constructs a new MutableShort with the specified value.
     * 
     * @param value
     *            the initial value to store, not null
     * @throws NullPointerException
     *             if the object is null
     */
    public MutableShort(Number value) {
        super();
        this.value = value.shortValue();
    }

    /**
     * Constructs a new MutableShort parsing the given string.
     * 
     * @param value
     *            the string to parse, not null
     * @throws NumberFormatException
     *             if the string cannot be parsed into a short
     * @since 2.5
     */
    public MutableShort(String value) throws NumberFormatException {
        super();
        this.value = Short.parseShort(value);
    }

    // -----------------------------------------------------------------------
    /**
     * Gets the value as a Short instance.
     * 
     * @return the value as a Short, never null
     */
    public Short getValue() {
        return new Short(this.value);
    }

    /**
     * Sets the value.
     * 
     * @param value
     *            the value to set
     */
    public void setValue(short value) {
        this.value = value;
    }

    /**
     * Sets the value from any Number instance.
     * 
     * @param value
     *            the value to set, not null
     * @throws NullPointerException
     *             if the object is null
     */
    public void setValue(Number value) {
        this.value = value.shortValue();
    }

    // -----------------------------------------------------------------------
    /**
     * Increments the value.
     * 
     * @since Commons Lang 2.2
     */
    public void increment() {
        value++;
    }

    /**
     * Decrements the value.
     * 
     * @since Commons Lang 2.2
     */
    public void decrement() {
        value--;
    }

    // -----------------------------------------------------------------------
    /**
     * Adds a value to the value of this instance.
     * 
     * @param operand
     *            the value to add, not null
     * @since Commons Lang 2.2
     */
    public void add(short operand) {
        this.value += operand;
    }

    /**
     * Adds a value to the value of this instance.
     * 
     * @param operand
     *            the value to add, not null
     * @throws NullPointerException
     *             if the object is null
     * @since Commons Lang 2.2
     */
    public void add(Number operand) {
        this.value += operand.shortValue();
    }

    /**
     * Subtracts a value from the value of this instance.
     * 
     * @param operand
     *            the value to subtract, not null
     * @since Commons Lang 2.2
     */
    public void subtract(short operand) {
        this.value -= operand;
    }

    /**
     * Subtracts a value from the value of this instance.
     * 
     * @param operand
     *            the value to subtract, not null
     * @throws NullPointerException
     *             if the object is null
     * @since Commons Lang 2.2
     */
    public void subtract(Number operand) {
        this.value -= operand.shortValue();
    }

    // -----------------------------------------------------------------------
    // bytValue relies on Number implementation
    /**
     * Returns the value of this MutableShort as a short.
     * 
     * @return the numeric value represented by this object after conversion to
     *         type short.
     */
    @Override
    public short shortValue() {
        return value;
    }

    /**
     * Returns the value of this MutableShort as an int.
     * 
     * @return the numeric value represented by this object after conversion to
     *         type int.
     */
    @Override
    public int intValue() {
        return value;
    }

    /**
     * Returns the value of this MutableShort as a long.
     * 
     * @return the numeric value represented by this object after conversion to
     *         type long.
     */
    @Override
    public long longValue() {
        return value;
    }

    /**
     * Returns the value of this MutableShort as a float.
     * 
     * @return the numeric value represented by this object after conversion to
     *         type float.
     */
    @Override
    public float floatValue() {
        return value;
    }

    /**
     * Returns the value of this MutableShort as a double.
     * 
     * @return the numeric value represented by this object after conversion to
     *         type double.
     */
    @Override
    public double doubleValue() {
        return value;
    }

    // -----------------------------------------------------------------------
    /**
     * Gets this mutable as an instance of Short.
     * 
     * @return a Short instance containing the value from this mutable, never
     *         null
     */
    public Short toShort() {
        return Short.valueOf(shortValue());
    }

    // -----------------------------------------------------------------------
    /**
     * Compares this object to the specified object. The result is
     * <code>true</code> if and only if the argument is not <code>null</code>
     * and is a <code>MutableShort</code> object that contains the same
     * <code>short</code> value as this object.
     * 
     * @param obj
     *            the object to compare with, null returns false
     * @return <code>true</code> if the objects are the same; <code>false</code>
     *         otherwise.
     */
    @Override
    public boolean equals(Object obj) {
        if (obj instanceof MutableShort) {
            return value == ((MutableShort) obj).shortValue();
        }
        return false;
    }

    /**
     * Returns a suitable hash code for this mutable.
     * 
     * @return a suitable hash code
     */
    @Override
    public int hashCode() {
        return value;
    }

    // -----------------------------------------------------------------------
    /**
     * Compares this mutable to another in ascending order.
     * 
     * @param other
     *            the other mutable to compare to, not null
     * @return negative if this is less, zero if equal, positive if greater
     */
    public int compareTo(MutableShort other) {
        short anotherVal = other.value;
        return value < anotherVal ? -1 : (value == anotherVal ? 0 : 1);
    }

    // -----------------------------------------------------------------------
    /**
     * Returns the String value of this mutable.
     * 
     * @return the mutable value as a string
     */
    @Override
    public String toString() {
        return String.valueOf(value);
    }

}